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1 /* |
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2 * 32.newphdr.c - implementation of the elf{32,64}_newphdr(3) functions. |
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3 * Copyright (C) 1995 - 2006 Michael Riepe |
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4 * |
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5 * This library is free software; you can redistribute it and/or |
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6 * modify it under the terms of the GNU Library General Public |
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7 * License as published by the Free Software Foundation; either |
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8 * version 2 of the License, or (at your option) any later version. |
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9 * |
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10 * This library is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 * Library General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Library General Public |
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16 * License along with this library; if not, write to the Free Software |
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 */ |
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19 |
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20 #include <private.h> |
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21 |
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22 #ifndef lint |
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23 static const char rcsid[] = "@(#) $Id: 32.newphdr.c,v 1.15 2006/07/07 22:15:41 michael Exp $"; |
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24 #endif /* lint */ |
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25 |
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26 static char* |
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27 _elf_newphdr(Elf *elf, size_t count, unsigned cls) { |
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28 size_t extcount = 0; |
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29 Elf_Scn *scn = NULL; |
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30 char *phdr = NULL; |
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31 size_t size; |
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32 |
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33 if (!elf) { |
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34 return NULL; |
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35 } |
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36 elf_assert(elf->e_magic == ELF_MAGIC); |
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37 if (!elf->e_ehdr && !elf->e_readable) { |
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38 seterr(ERROR_NOEHDR); |
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39 } |
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40 else if (elf->e_kind != ELF_K_ELF) { |
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41 seterr(ERROR_NOTELF); |
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42 } |
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43 else if (elf->e_class != cls) { |
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44 seterr(ERROR_CLASSMISMATCH); |
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45 } |
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46 else if (elf->e_ehdr || _elf_cook(elf)) { |
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47 size = _msize(cls, _elf_version, ELF_T_PHDR); |
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48 elf_assert(size); |
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49 if (!(scn = _elf_first_scn(elf))) { |
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50 return NULL; |
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51 } |
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52 if (count) { |
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53 if (!(phdr = (char*)malloc(count * size))) { |
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54 seterr(ERROR_MEM_PHDR); |
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55 return NULL; |
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56 } |
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57 memset(phdr, 0, count * size); |
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58 } |
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59 elf_assert(elf->e_ehdr); |
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60 elf->e_phnum = count; |
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61 if (count >= PN_XNUM) { |
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62 /* |
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63 * get NULL section (create it if necessary) |
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64 */ |
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65 extcount = count; |
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66 count = PN_XNUM; |
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67 } |
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68 if (cls == ELFCLASS32) { |
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69 ((Elf32_Ehdr*)elf->e_ehdr)->e_phnum = count; |
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70 scn->s_shdr32.sh_info = extcount; |
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71 } |
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72 #if __LIBELF64 |
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73 else if (cls == ELFCLASS64) { |
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74 ((Elf64_Ehdr*)elf->e_ehdr)->e_phnum = count; |
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75 scn->s_shdr64.sh_info = extcount; |
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76 } |
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77 #endif /* __LIBELF64 */ |
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78 else { |
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79 seterr(ERROR_UNIMPLEMENTED); |
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80 if (phdr) { |
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81 free(phdr); |
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82 } |
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83 return NULL; |
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84 } |
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85 if (elf->e_phdr) { |
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86 free(elf->e_phdr); |
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87 } |
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88 elf->e_phdr = phdr; |
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89 elf->e_phdr_flags |= ELF_F_DIRTY; |
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90 elf->e_ehdr_flags |= ELF_F_DIRTY; |
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91 scn->s_scn_flags |= ELF_F_DIRTY; |
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92 return phdr; |
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93 } |
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94 return NULL; |
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95 } |
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96 |
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97 Elf32_Phdr* |
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98 elf32_newphdr(Elf *elf, size_t count) { |
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99 return (Elf32_Phdr*)_elf_newphdr(elf, count, ELFCLASS32); |
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100 } |
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101 |
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102 #if __LIBELF64 |
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103 |
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104 Elf64_Phdr* |
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105 elf64_newphdr(Elf *elf, size_t count) { |
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106 return (Elf64_Phdr*)_elf_newphdr(elf, count, ELFCLASS64); |
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107 } |
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108 |
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109 unsigned long |
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110 gelf_newphdr(Elf *elf, size_t phnum) { |
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111 if (!valid_class(elf->e_class)) { |
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112 seterr(ERROR_UNKNOWN_CLASS); |
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113 return 0; |
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114 } |
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115 return (unsigned long)_elf_newphdr(elf, phnum, elf->e_class); |
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116 } |
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117 |
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118 #endif /* __LIBELF64 */ |